This program patches the dos.library function AbortPkt() to send an
ACTION_ABORT packet. In dos.library 40.3 AbortPkt() does nothing at
all so things can only improve.
The ACTION_ABORT packet type wasn't reserved by Commodore so initally
only very few handlers will understand it.
Supporting ACTION_ABORT makes a Unix-like select() or poll() on
dos.library file handles possible, which is (IMHO) an important feature
for interactive handlers and network filesystems.
Please Note: This is only a proposal and the ACTION_ABORT isn't
officially reserved (yet).